Malicious PDF — malware analysis report

Static analysis result for SHA-256 919245d772003008…

MALICIOUS

PDF

90.1 KB Created: 2021-03-11 20:20:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: aee47b1d2a05bf11237a3e954f75d5f4 SHA-1: b984dd2f3d28541a333eba8e3de87510226e62a6 SHA-256: 919245d77200300840bb51ee284111cf002b1f2e528b13490de01ca0b8d6aee4
142 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an urgency-based lure. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://kuzutuzo.ru/123?utm_term=cooling+tower+performance+report PDF link annotation
    • http://doctora.club/brother_dcp-_l2520dw_service_manual11qcc.pdfIn PDF document text
    • http://kevakigev.medianewsonline.com/mivikekemif.pdfIn PDF document text
    • https://devumevone.weebly.com/uploads/1/3/4/5/134589636/valopuvafo_fumojexap_tamimoxiwixil_dakerepitugo.pdfIn PDF document text
    • http://keepmaxi.space/which_word_does_not_belong_to_the_group_brainlyd6ml3.pdfIn PDF document text
    • http://xuruwerufasafer.22web.org/are_shakes_half_price_at_sonic_during_happy_hour.pdfIn PDF document text
    • https://dinabowufijub.weebly.com/uploads/1/3/4/7/134751612/fabizomobel.pdfIn PDF document text
    • http://jokojujut.medianewsonline.com/boating_knots_bumpers.pdfIn PDF document text
    • http://rilotelexewobos.iblogger.org/nomozemotuf.pdfIn PDF document text
    • http://clobuss.ru/pottery_making_illustratedo5s3v.pdfIn PDF document text
    • https://jufozawuvinuxak.weebly.com/uploads/1/3/5/3/135326647/duboto.pdfIn PDF document text
    • http://rentline.pro/personality_types_ranked_by_rarityavh3g.pdfIn PDF document text
    • https://finaxapiw.weebly.com/uploads/1/3/5/3/135301963/sebedetujavonipow.pdfIn PDF document text
    • https://mijezuri.weebly.com/uploads/1/3/0/9/130969422/pojusagewumedonabupo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://xamilelamijokuk.rf.gd/learn_android_programming_step_by_step_free_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b82812c5-83a4-49e5-84dc-c21321269997/brother_intellifax_775_cartridge_installation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4e41eef-a4f7-48ec-b941-1b338fbd2c1d/bushnell_telescope_voyager_with_sky_tour.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36f545e2-9814-4709-927b-a0fa2b1a1ecd/beginning_r_the_statistical_programming_language_book.pdfIn PDF document text
    • http://jifunujori.rf.gd/nijujuwagejarox.pdfIn PDF document text
    • http://welavosapo.rf.gd/performance_appraisal_translation_in_kannada.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9B 5512 bytes
SHA-256: eff6c8ac48e25c061fd335f92f08f7ec5974c136072ed9e0a34370cea2602126
font_01_sfnt_off000100e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E5 5156 bytes
SHA-256: 06e32e349c791cdd47b4e7fb21c4853447c9e954d8f2c88ecda80235216914d6
font_02_sfnt_off0001126c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1126C 11904 bytes
SHA-256: 539525272891377b5bc6c9bc9f73b6b575243fe6a95d5e03e3d6cff6a6419731
font_03_sfnt_off000138cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138CF 16076 bytes
SHA-256: 12198ed304d8e74df64bcaa8a4aae6da6436d73ceeb6d758e01031f89a18fcfe
font_04_sfnt_off00014db5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DB5 3092 bytes
SHA-256: f43a680dc8fc14c4923ea15b7ff496c9e86d581601a33fa3b4ff9a123e432981

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